Mechanical pump complication after HeartMate 3 implantation

Area of Science:

• Cardiology
• Biomedical Engineering
• Surgical Technology

Background:

• Left ventricular assist device (LVAD) implantation has improved survival, but long-term complications require further investigation.
• Reducing late complications is crucial for optimizing clinical outcomes in LVAD patients.

Purpose of the Study:

• To determine the incidence of mechanical pump failure requiring surgical intervention after HeartMate 3 LVAD implantation.
• To define pump failure as outflow graft compression, obstruction, or pump thrombosis necessitating surgery.

Main Methods:

• A retrospective study of 141 adult patients who received HeartMate 3 LVADs via the "cut-then-sew" technique (September 2015 - September 2021).
• Primary endpoint: mechanical pump complications (outflow graft obstruction/pump thrombosis) requiring surgery.
• Secondary endpoints: bleeding, stroke, renal failure, length of stay, and survival; median follow-up: 27.3 months.

Main Results:

• Eleven patients (7.8%) experienced mechanical pump complications: 6 with outflow graft obstruction, 5 with pump thrombosis.
• Median time to mechanical complication was 828 days.
• Of 11 surgically treated patients, 10 (90%) survived to discharge; overall survival at 1, 3, and 5 years was 82.9%, 69.1%, and 55.2%.

Conclusions:

• The 7.8% mechanical pump complication rate, with a median onset of 828 days, suggests a significant late complication following LVAD implantation.
• This study underscores the importance of monitoring and managing late-onset mechanical pump issues in LVAD recipients.